<template>
  <div class="app">
    <h3>我是App组件（祖）</h3>
    <Child></Child>
  </div>
</template>

<script>
import {ref, reactive, toRefs, readonly, isRef, isReactive, isReadonly, isProxy} from 'vue'

  export default {
    name: 'App',
    setup(){
      let car = reactive({
        name: '奔驰',
        price: '40W'
      })
      let sum = ref(0)
      let car2 = readonly(car)
      console.log(isRef(sum));
      console.log(isReactive(car));
      console.log(isReadonly(car2));
      console.log(isProxy(car2));

      return {
        ...toRefs(car)
      }
    }
  }
</script>

<style>
  .app {
    background-color: gray;
    padding: 10px;
  }
</style>